Looking for a quality replacement air filter that will fit your AFE cold air intake? Look no further than the 21-90037 Replacement Pro Dry S Air Filter! This high-flow, oil-free conical performance filter is designed specifically for use with the AFE 51-30392 cold air intake, and features two layers of progressively finer mesh synthetic media for excellent airflow and dust holding capacity. The tall open evenly spaced pleats provide maximum convenience and easy maintenance, while the pliable polyurethane flange with integrated bumps ensures a tight, no leak seal over the life of the filter. Washable and reusable for multiple cleanings, this air filter is an excellent choice for those looking for quality and value.